Speed-governing mechanism



i? SLATES ff- RICHARD 0. M LLER, or HARTFORD, GONNE CTICU 'VASSIG GR:TpEH3 mimic TURBINE COMPANY, OF HARTFORD; CONNECTICUT, VAI'CORPORATIQNIOE CONNECT Y iApplicatibn' filed: J m; 8, 1,927,; Serial N6} 157383 ff j"lflhisf i veption relates to speed governing n'i'e clmnieins" partieularly for [steam prime ffl i'oversysueh' for example as steani tulqbiiieys, and has, as its aim} fie provide a iiiechfanisni 1'2i,nge"0fspeec1 of the prime mover Arid aixfeiy y ilose speed regulation at any parti c ulzpii oi" seleciiedspeed. f 1

' Wassociated prime mover.

'- 5Afi1 fthei' aim ofthe inventionisfce pro fvid e an improved arrangement by ineai sj iwhlch the flow of actuatlng fluid t0 theflp'r me' mover aixtoin'aticxlly shut'bfi ih tl ieevenb OjEBISPBGdiDg Of thepi'ime. m'overihrqugh "T Qfa' lick 10f load; .Furtlie fmore in accordance J with the invention, provision is made fei eufioi i ziticall y stepping: the rime ngvet in the event of failure of pi opefoperatio ia 11 'the.p arb of the governor. L 7' i f f xOthetf' objects Will be in pzirt obvious and I 3Q ments and arrangement of "paft's whichjwill be; exemplified in' theconstructioiiighef 7 "a ter 's et'forthfiiid the seeps- 0f-the-"zipbi' 7 ,"i'ientof which'will b i icl'ez ted i1i5 1t Q pzideclclaiins.

I [In the 'aceo-mpanying:drawingivhe ei Va flea may take 7 he :figurel's generz .011 11 1 ;whichmyfmve m vhe'elf 11 provided with buckets or poel'zete 1" i he rotor isrfi'xed aoashmft lfimouritied 4.1{111' suitable 'Vb'earing's 14. 15 designatesjhe .SPEED-GOVER ING'MEoH NIsfi q 7 we sh'mi 1i, 1no1"e {fir-lees "diagriuiii mfiieally,

one (if theenibod mene whichfthep esieiit n:

i g nozz e iiofwhieh she 'fajceuatingfiuid' 01 Ste am is admitted throughapipe 16 and? passage pump iweo'rineeted by a pipe k9tpf theipy fremnny suitabl-eoiirefb v s p mm;- ioif eii heel "of the prime ii oveif iso *th 1;; as the epeed Of, the y'yheel; ,ch2 nges i -l e i This valvg as in the; event; thait t li e lire cause fail 130" Qper fla, is mused: to seat on the upper 's'urfgee ofithe' packing A I eny;si1ita-le annenuas for example through? p" "gears" 47 The pump" m'elnajbefslv 45* are low-ted; in 12 an Outlet 'de :(jfth J der 29 beneath the piston 30. Between the delivery side'of the pump and-the chamber 18 is a bypass 50 which is controlled by by pass valve 51 of any suitable construction.

The operation of the mechanism described is briefly as tollows: The lby-pass valve 51 may be manually adjusted so as to control the pressure to t-he delivery side of the pur 45 depending on the desired speed of the tur bine. -lV'l1e1'1 the turbineis at rest, the valve 35 is seated. To start the turb1ne,.tlns valve may be manually raised from its seat by means of a screw 55 adapted to be brought up against and lift the piston 30 When the turbine is put into operation, the pump 'is driven, setting up a pressure in the cylinder 29 below'thepiston so that th'e'needle valve will be raisedfinto proper relation to its seat,

so; long as the turbine is i'otating' at the desired speed, the needle valve wi ll permit-the correct amount of steam to flow into thenozzle 15. y In the event,ghowever,' that the speed of theturbine should increase above that selected, the pump would be driven taster there-7 by creating agreater pressure behind thepiston with the result that the needle valve would be moved toward its seat torrestrict the flow of steam to the nozzle and the turbine would be brought back to the desiredspeed- In the event thatthe turbine should'fall below the predetermined speed, the pump would be driven slower sothat the pressure .behind the piston would drop and the needle valve under the influence of the spring ll,

would move away from its 7 with? the result that a greater amount of steam would be admitted to the'turb me bringing the turbine up'to speed; Thus the-speedol the tinits seat, thereby preventing any steam from pump should be speeded up through lackot load, the oil pressure withinthecylind bine is held very closely to; that selec-ted, By adjusting the by-pass valve .5 l,nnydesired selected speed of the turbine may be,

obtained within a wide range,

- l 3 The needle valve 25 also consti tnteshan over-speed valve in that. in the event that the 29 would increase to close and holdthe valve "to flowing into the nozzle. 7 r

Ifthe pump should atailto set up a pressure behind the piston30the machine woi ild' be imting oil-the flow of steam-to thenozzlej v a mediately shut down, forin thateventthe spr ng/l1 would move, the stem to La po 'sition where the auxiliary valveor sleevo gh restsflupon the top otthefnut 38 thus shut- As many changesfcould be made in. the

above; construction and 7 many apparently. widely difierent embodiments of this lliVBlT- tion eouldbelmadewithout departing from the scopethereof, it is intended thatall mat- .ter] contained-gin. vthe above 'jdescription -01? fluid theretoduring'the normal operation of the same, an auxiliary valve movable with said first mentioned valve, a spring normally urging said first mentioned valve away "from its seat and said auxiliary valve to ,a position Where it shutsofi' the admission steam to' said'pri'me mover, ,a pressure responsive device associated with said valves'and acting in opposition: to; said spring, and a pump driven. by said prime .mover for controlling y thepress'ure n'sa d pressure respons ve device. l V

2. In'combination, a steamturbine having awheel, and a steamnoz-zle,"a needle valve in said nozzle forcontrolling the volume of steam passing therethrough, anoutlet' lead ing tosaid nozzle, an auxiliary valve on said needle and movable therewith for shutting ofi the flow-of steam .to said nozzle, a spring normally urging said needle in a direction to move it from its seat andsaid'auxiliary valve to closedposition, a piston on said needle,

a cylinder in which said piston operates. a

fluid chamber, a connection between said ilui d chamber and cylinder, a pressure pump interposed in sald connection and driven by d turbine, a bypass between the delivery side fol sa d pumpand said chamber, and a valve for controlling said by-pass. V v 3. In eombi'natioma.steam turbine havin ashaft,a wheel thereon and a steam nozzle:

a needlevalve'in said nozzle tor controlh-agt the volume of steam passing theretl'n'ough, a

springnormally urg-ingsaid needle valve in a direction to move it away from its scat,

a pis'ton'on said needle valve-pa cylinder in which saidpiston operates, an oil chamber through which sa d shaft extends, a bearing forsaidshattwithin said chamber, a connexion'between said oil chamber and cylinder. a

pressure pump located entirely within said oll chamberanddri-ven by said turbine "for Z forcing the oil from saidchamberinto said connection, a bypass, between the delivery side of saidpump and .said chamber, and a manually operable valve forvcontrolling said i y-ras l i r a -MULLER,

" i shown in the accompanying drawingshall be i mg sense.

interpreted as illustrative and .notbiir a, limit- 

